CN109644385A

CN109644385A - A kind of call-establishing method and device

Info

Publication number: CN109644385A
Application number: CN201780053868.XA
Authority: CN
Inventors: 贾银元
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2019-04-16
Anticipated expiration: 2037-05-19
Also published as: US20200228578A1; WO2018209709A1; CN109644385B

Abstract

The embodiment of the present application discloses a kind of call-establishing method, is related to field of communication technology.This method is invented to solve the case where LTE terminal presence existing in the prior art can not effectively provide voice service.This method comprises: terminal receives the first notification message, which includes the first IMS call-in reporting message.Terminal establishes the first IMS calling connection according to first notification message and distributes resource for the first IMS calling connection.Terminal receives second notification message, which includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent.Terminal discharges the resource that the first IMS calling connection occupies according to the second notification message.Call-establishing method provided by the embodiments of the present application is applied during LTE terminal establishes voice communication.

Description

A kind of call-establishing method and device

Technical field

This application involves field of communication technology more particularly to a kind of call-establishing methods and device.

Background technique

Based on long term evolution (Long Term Evolution, LTE voice communication (Voice over LTE), VoLTE) technology is the voice solution based on IP multimedia subsystem (Internet Protocol Multimedia Subsystem, IMS) that LTE network provides.Circuit switching (Circuit Switched, CS) network transmission voice is used in traditional 2G, 3G network, when carrying out voice communication by CS network, CS network can distribute a fixed channel for both call sides.And VoLTE technology transmits voice using the high speed bandwidth of LTE network, realizes voice communication no longer occupying traditional talk channel by IP network transmission.But during LTE network is gradually disposed, the case where traditional 2G, 3G network and LTE network coexist, will continue for quite a long time.Therefore, existing most of terminal had not only supported LTE network but also had supported traditional 2G, 3G network, can be realized the switching between LTE network and 2G, 3G network.This Terminal Type is when handling voice service, ordinary priority establishes calling connection by IMS network (namely voice solution of LTE network offer), calling connection is established when calling connection can not be successfully established by IMS network, then through CS network (the also voice solution that 2G, 3G network provide).

During user states the voice services such as terminal progress making and receiving calls in use, might have such experience: as shown in Figure 1a, the first user initiates first time call request to the second terminal 12 of the support LTE function of second user using first terminal 11.As shown in Figure 1 b, the first user and second user successfully carry out first time call, and the time of the call for the first time is very short (in Fig. 1 b by taking the duration of call is 15 seconds as an example).As illustrated in figure 1 c, in terminating the very short time (such as several seconds) after the call for the first time, when first user initiates second of call request to the second user again using first terminal 11, even if second user is not used second terminal 12 and carries out any call, second terminal 12 still replys message such as " being busy now " and refuses second of call request.And in fact, second terminal 12 is not in talking state.Therefore, when providing voice service, there are still effectively can not provide voice service to the existing terminal for supporting LTE function.

Summary of the invention

First aspect, a kind of call-establishing method is provided, this method is applied to terminal, this method comprises: terminal receives the first notification message, first notification message includes the first IMS call-in reporting message, then, terminal establishes the first IMS calling connection according to first notification message and distributes resource for the first IMS calling connection.Terminal receives second notification message, and then, terminal discharges the resource that the first IMS calling connection occupies according to the second notification message.Wherein, which includes any one in following message: instruction message, the 2nd IMS call-in reporting message that CS notification message, network side equipment are sent.

Wherein, the CS notification message includes that notification message has been established in CS call-in reporting message, CS calling connection, CS call begins setting up message, any one in CS end of conversation instruction message.The network side equipment is sent Instruction message, be used to indicate terminal and discharge the resource that the first IMS calling connection occupies.

Pass through the above method, terminal is during establishing IMS calling connection, if receive CS notification message, the instruction message that network side equipment is sent, any one message in the 2nd IMS call-in reporting message, then show that IMS calling connection fails, terminal discharges the resource that the IMS calling connection established occupies in time, can economize on resources.

When receiving second notification message in view of terminal, terminal may currently be successfully established IMS calling connection, and be conversed using the IMS calling connection.Then it has been interrupted in the call that the resource that the IMS calling connection of speech phase occupies causes this in progress in order to avoid accidentally releasing this, optionally, in a kind of implementation of first aspect, the terminal determines whether the first IMS calling connection is in establishment process according to the second notification message；If the first IMS calling connection is in establishment process, terminal if, discharges the resource that the first IMS calling connection just in establishment process occupies.

Optionally, when the second notification message is the 2nd IMS call-in reporting message, the second calling number and the second call identification are carried in the 2nd IMS call-in reporting message；And the first calling number and the first call identification are carried in the first IMS call-in reporting message.Then in a kind of implementation of first aspect, the terminal discharges the resource that the first IMS calling connection occupies, comprising: whether terminal first calling number and second calling number are identical according to second notification message；Compare first call identification and whether second call identification is identical；If first calling number is identical with second calling number, and first call identification is different with second call identification, and terminal then discharges the resource that the first IMS calling connection occupies.

Optionally, in a kind of implementation of first aspect, in the terminal according to the second notification message, after discharging the resource that the first IMS calling connection occupies, the method also includes: terminal establishes the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.

In the prior art, since terminal discharges the resource of the first IMS calling connection occupancy not in time, then for terminal when receiving the 2nd IMS call-in reporting message, terminal refuses the 2nd IMS incoming call.In the application, in this implementation, after the resource that terminal discharges that the first IMS calling connection occupies, terminal can establish the 2nd IMS calling connection to respond the 2nd IMS call-in reporting message.

Second aspect provides a kind of terminal, comprising: receiving unit, for receiving the first notification message, which includes the first IMS call-in reporting message.Connection establishment unit, for establishing the first IMS calling connection according to received first notification message of the receiving unit and distributing resource for the first IMS calling connection.The receiving unit is also used to receive second notification message, which includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent.Connection Release unit, for discharging the resource that the first IMS calling connection occupies according to the received second notification message of the receiving unit.

Optionally, the CS notification message includes that notification message has been established in CS call-in reporting message, CS calling connection, CS call begins setting up message, any one in CS end of conversation instruction message.The instruction message that the network side equipment is sent is used to indicate terminal and discharges the resource that the first IMS calling connection occupies.

In a kind of implementation of second aspect, the Connection Release unit is also used to determine whether the first IMS calling connection is in establishment process according to the second notification message.When the first IMS calling connection is in establishment process, the resource that the first IMS calling connection just in establishment process occupies is discharged.

In a kind of implementation of second aspect, the second notification message is the 2nd IMS call-in reporting message, The first calling number and the first call identification are carried in the first IMS call-in reporting message；The second calling number and the second call identification are carried in the 2nd IMS call-in reporting message.The then Connection Release unit, is also used to the first calling number described in comparison and whether second calling number is identical；Compare first call identification and whether second call identification is identical.When first calling number is identical with second calling number, and first call identification is with the second call identification difference, the resource that the first IMS calling connection occupies is discharged.

In a kind of implementation of second aspect, the connection establishment unit is also used to establish the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.

The third aspect, a kind of terminal is provided, the terminal includes transceiver, one or more processors and memory, the memory is for storing computer program code, the computer program code includes instruction, when one or more of processors execute described instruction, the terminal executes method described in first aspect.

Fourth aspect provides a kind of computer readable storage medium, instruction is stored in the computer readable storage medium, when run on a computer, so that computer executes method described in above-mentioned first aspect.

5th aspect provides a kind of computer program product, and the computer program product includes instruction, when run on a computer, so that computer executes method described in first aspect.

Detailed description of the invention

Fig. 1 a is the interface schematic diagram that calling terminal initiates IMS call request to LTE terminal in the prior art；

Fig. 1 b is the interface schematic diagram that calling terminal and LTE terminal establish CS call according to call request；

Fig. 1 c is that in the prior art, initiation IMS call request but LTE terminal refuse the interface schematic diagram of the IMS call request after calling terminal CS end of conversation shown in Fig. 1 b；

Fig. 2 is the structural schematic diagram for supporting the mobile phone of LTE function；

Fig. 3 a is the interaction flow schematic diagram that LTE terminal establishes IMS calling connection in the prior art；

Fig. 3 b is that LTE terminal receives the interaction flow schematic diagram for refusing second of IMS call request after second of IMS call request in establishing IMS call connection process in the prior art；

Fig. 4 is a kind of interaction flow schematic diagram of call-establishing method provided by the embodiments of the present application；

Fig. 4 a be it is provided by the embodiments of the present application it is a kind of be IMS calling connection distribution resource log log schematic diagram；

Fig. 4 b is the log log schematic diagram that a kind of release IMS calling connection provided by the embodiments of the present application occupies resource；

Fig. 5, Fig. 5 a, Fig. 5 b are the interaction flow schematic diagram of another call-establishing method provided by the embodiments of the present application；

Fig. 6, Fig. 6 a are the interaction flow schematic diagram of another call-establishing method provided by the embodiments of the present application；

Fig. 7 is to cancel the first time call request after calling terminal initiates first time call request, initiates second of call request, called terminal refuses the interaction flow schematic diagram of second of call request；

Fig. 8 is the interaction flow schematic diagram of another call-establishing method provided by the embodiments of the present application；

Fig. 9 is the interaction flow schematic diagram of another call-establishing method provided by the embodiments of the present application；

Figure 10 is a kind of structural schematic diagram of terminal provided by the embodiments of the present application；

Figure 10 a is the structural schematic diagram of another terminal provided by the embodiments of the present application；

Figure 10 b is the structural schematic diagram of another terminal provided by the embodiments of the present application.

Specific embodiment

The network side equipment of the embodiment of the present application meaning be responsible for processing voice service core net, the general designation of access network equipment, the Session Border Controller (Session Border Controler, SBC) including core net, Proxy Call Session Control Function (Proxy Call Session Control Function, P-CSCF) equipment, (Serving Call Session Control Function, S-CSCF) equipment, application server (Application Server, AS), the equipment such as home signature user server (Home Subscriber Server, HSS).Network side equipment further includes the equipment such as the evolved base station (Evolved Node B, eNB) of access net.The effect and interaction of these equipment can refer to the prior art, and the embodiment of the present application repeats no more.Due to present application relates generally to the treatment process of terminal, for ease of description, these equipment are referred to as network side equipment by the embodiment of the present application.It is understood that the Calling Side network equipment is used in call establishment and calling terminal interaction.The callee side network equipment is used in call establishment and called terminal interaction.

With the development of communication technology, more and more terminals support LTE function.By taking the terminal for supporting LTE function is mobile phone as an example, as shown in Figure 2, the mobile phone 100 includes: the components such as radio frequency (radio frequency, RF) circuit 110, memory 120, input unit 130, modem 140, processor 150, power supply 160, display unit 170, gravity sensor 180, voicefrequency circuit 190.It will be understood by those skilled in the art that handset structure shown in Figure 2 does not constitute the restriction to mobile phone, it may include perhaps combining certain components or different component layouts than illustrating more or fewer components.

Each functional unit of mobile phone 100 is introduced separately below:

Wherein, RF circuit 110 can be used for receiving and sending messages or communication process in, signal sends and receivees, and particularly, after the downlink information of base station is received, handles to processor 150；In addition, the data of uplink are sent to base station.In general, RF circuit includes but is not limited to antenna, at least one amplifier, transceiver, coupler, low-noise amplifier (low noise amplifier, LNA), duplexer etc..In addition, RF circuit 110 can also be communicated with network and other equipment by wireless communication.Any communication standard or agreement can be used in the wireless communication, including but not limited to global system for mobile communications (global system of mobile communication, GSM), general packet radio service (general packet radio service, GPRS), CDMA (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), long term evolution (long term evolution, LTE), Email, short message service (short messaging service, SMS) etc..

Memory 120 can be used for storing software program and module, which is stored in the software program and module of memory 120 by operation, thereby executing the various function application and data processing of mobile phone 100.Memory 120 can mainly include storing program area and storage data area, wherein, storing program area can application program (Application, APP) needed for storage program area, at least one function etc., such as sound-playing function, image player function etc.；Storage data area, which can be stored, uses created data (such as audio data, image data, phone directory etc.) etc. according to mobile phone 100.In addition, memory 120 may include high-speed random access memory, it can also include nonvolatile memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.

Input unit 130 can be used for receiving the number or character information of input, and generate key signals input related with the user setting of mobile phone 100 and function control.Specifically, input unit 130 may include touch screen 131 and other input equipments 132.Touch screen 131, also referred to as touch panel, collect user on it or nearby touch operation (such as user using any suitable object such as finger, stylus or Operation of the attachment on touch screen 131 or near touch screen 131), and corresponding attachment device is driven according to preset formula.Optionally, touch screen 131 may include both touch detecting apparatus and touch controller.Wherein, the touch orientation of touch detecting apparatus detection user, and touch operation bring signal is detected, transmit a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into contact coordinate, then gives processor 150, and can receive order that processor 150 is sent and be executed.Furthermore, it is possible to realize touch screen 131 using multiple types such as resistance-type, condenser type, infrared ray and surface acoustic waves.In addition to touch screen 131, input unit 130 can also include other input equipments 132.Specifically, other input equipments 132 can include but is not limited to one of physical keyboard, function key (such as volume control button, power switch button etc.), trace ball, mouse, operating stick etc. or a variety of.

Modem 140, the business carried according to it can logically be divided into CS module, LTE module, VoLTE module.Wherein.CS module is used to carry the data service of LTE network for carrying CS business, LTE module, and VoLTE module is for carrying VoLTE business.

Display unit 170 can be used for showing information input by user or be supplied to the information of user and the various menus of mobile phone 100.Display unit 170 may include display panel 171, optionally, display panel 171 can be configured using the forms such as liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED).Further, touch screen 131 can cover display panel 171, after touch screen 131 detects touch operation on it or nearby, processor 150 is sent to determine the type of touch event, is followed by subsequent processing device 150 according to the type of touch event and corresponding visual output is provided on display panel 171.Although in Fig. 2, touch screen 131 and display panel 171 are the input and input function for realizing mobile phone 100 as two independent components, but it is in some embodiments it is possible to touch screen 131 and display panel 171 is integrated and that realizes mobile phone 100 output and input function.

Gravity sensor (gravity sensor) 180, it can detecte the size of mobile phone (generally three axis) acceleration in all directions, size and the direction that can detect that gravity when static can be used to identify application (such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, percussion) of mobile phone posture etc..

Mobile phone 100 can also include other sensors, such as optical sensor.Specifically, optical sensor may include ambient light sensor and close to optical sensor.Wherein, ambient light sensor can adjust the brightness of display panel 131 according to the light and shade of ambient light；Whether have object come close to or in contact with mobile phone, can close display panel 131 and/or backlight when mobile phone 100 is moved in one's ear if can detecte close to optical sensor.The other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor that mobile phone 100 can also configure, details are not described herein.

Voicefrequency circuit 190, loudspeaker 191, microphone 192 can provide the audio interface between user and mobile phone 100.Electric signal after the audio data received conversion can be transferred to loudspeaker 191 by voicefrequency circuit 190, be converted to voice signal output by loudspeaker 191；On the other hand, the voice signal of collection is converted to electric signal by microphone 192, audio data is converted to after being received by voicefrequency circuit 190, then audio data is exported to RF circuit 110 to be sent to such as another mobile phone, or audio data is exported to memory 120 to be further processed.

Processor 150 is the control centre of mobile phone 100, utilize the various pieces of various interfaces and connection whole mobile phone, by running or executing the software program and/or module that are stored in memory 120, and call the data being stored in memory 120, the various functions and processing data for executing mobile phone 100, to carry out integral monitoring to mobile phone.Optionally, processor 150 may include one or more processing units；Optionally, processor 150 can integrate application processor and modem processor, wherein the main processing operation system of application processor, user interface and application program etc., modem processor mainly handles wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 150.

Mobile phone 100 further includes the power supply 160 (such as battery) powered to all parts, optionally, power supply can be logically contiguous by power-supply management system and processor 150, to realize the functions such as management charging, electric discharge and power managed by power-supply management system.

Although being not shown, mobile phone 100 can also include antenna, Wireless Fidelity (Wireless-Fidelity, WiFi) module, wireless near field communication (Near Field Communication, NFC) module, bluetooth module, loudspeaker, accelerometer, gyroscope etc..

Currently, when the terminal opens VoLTE function, which initiates LTE registration by sending EMM_ATTACH_REQ message to network side, which carries registration type field and voice domain capable field for LTE terminal.In general, the registration type field is combined registering, namely ps domain both it had been registered to or had been registered to the domain CS.The value of voice domain ability is that " ims voice perferred cs voice as secondary " is also not only to have supported IMS voice but also supported CS voice, and the priority of IMS voice is higher than the priority of CS voice.LTE succeeds in registration, and LTE terminal receives after carrying the field that expression network side also supports IMS ability in the response message (EMM_ATTACH_ACP) to succeed in registration that network side is sent, initiate IMS public data network (Public Data Network, PDN) the process activated, then terminal initiates IMS registration process to be registered to IMS core net, LTE terminal is registered to LTE network and the specific implementation process of IMS network can refer to the prior art, and details are not described herein again.

In this way, when there is new call request, network side equipment is by checking the voice domain ability of terminal, when the voice domain ability that the terminal carries is " ims voice perferred cs voice as secondary ", this call request is preferentially completed by IMS network, when being unable to complete this call request by IMS network, which is fallen back into CS network to complete this call request by CS network.Specifically, as shown in Figure 3a, other terminals as caller to LTE terminal initiate calling and establish calling connection process the following steps are included:

201, calling terminal sends call request to the Calling Side network equipment.

Wherein, which both can be the mobile terminals such as mobile phone, or the fixed terminals such as base；The calling terminal both can be the terminal of support LTE function, or only support the terminal of 2G, 3G function.The call request that the calling terminal issues both can be IMS call request, or traditional CS call request, the type of the call request are unlimited.

In Fig. 3 a by the call request be IMS call request for be illustrated namely calling terminal to the Calling Side network equipment send INVITE request message.

202, the Calling Side network equipment sends INVITE request message to the callee side network equipment.

203, the callee side network equipment sends INVITE request message and open CS to LTE terminal retries (CS-Retry) timer T1.

This step in the specific implementation, the callee side network equipment receive the Calling Side network equipment transmission INVITE request message after, the callee side network equipment check LTE terminal voice domain ability confirmation LTE terminal support IMS call.When callee side network validation LTE terminal supports IMS call, callee side network forwards the INVITE request message to notify LTE terminal IMS network to have new incoming call by IMS network to LTE terminal.

It should be noted that, if in step 201, the type for the call request that calling terminal is sent to the Calling Side network equipment is non-IMS call request, for example CS call request, after then the callee side network equipment receives the CS call request that the Calling Side network equipment is sent, LTE terminal is sent to after converting IMS call request for the CS call request.

After the callee side network equipment sends INVITE request message to LTE terminal, CS-Retry timer T1 is opened.If before CS-Retry timer T1 time-out, the callee side network equipment does not receive the particular message of LTE terminal transmission, the 183Session Progress message that such as terminal is sent in the case where supporting resource reservation or the 180RING message that terminal is sent in the case where not supporting resource reservation.Then the callee side network equipment thinks that the calling connection of IMS network establishes failure, and then re-initiates CS paging to LTE terminal, to establish calling connection by CS network and complete this time to converse.

204, after LTE terminal receives the INVITE request message that the callee side network equipment is sent, opening timing device T2 begins setting up IMS network calling connection, and distributes resource for this IMS network calling connection.

Wherein, timer T2 is called jingle bell timer and/or affairs timer (transaction timer).The duration of called jingle bell timer is generally 60s or so, and the duration of transaction timer is generally 185s or so.According to terminal, affiliated manufacturer is different, and terminal after receiving the invite message, may only open transaction timer, it is also possible to only open called jingle bell timer；Transaction timer may also not only be opened but also open called jingle bell timer.

LTE terminal opening timing device T2 and can create the media resources such as thread, storage allocation, reserved audio-video after the INVITE message for receiving the transmission of the callee side network equipment for the call request of this IMS network, initialize the related example etc. of IMS agreement.

If the LTE terminal jingle bell before T2 time-out, shows that the calling connection of this IMS network is successfully established, caller and called both sides can start to converse.If the non-jingle bell of LTE terminal before T2 time-out, LTE terminal, which is considered as, this time establishes failure in the calling connection of IMS network, then can just discharge allocated resource.

205, the callee side network equipment initiates CS paging to LTE terminal to establish CS calling connection and complete this time to converse by CS network after the success of CS calling connection after T1 time-out.

As it was noted above, network side equipment can open CS-Retry timer T1 while sending INVITE message to terminal.But in practical application, due to IMS network dtr signal etc., the CS-Retry timer T1 time-out for causing network side equipment to be opened, and then network side equipment and terminal are held consultation to establish CS calling connection and complete this time to call by CS network.The reason for leading to T1 time-out includes: network side equipment before CS-Retry timer T1 time-out, does not receive the particular messages such as 183Session Progress message or 180RING always；Or be also possible to as network side equipment before CS-Retry timer T1 time-out, do not receive the 100TRYING message of terminal replies always.After CS-Retry timer T1 time-out, network side equipment thinks that IMS calling connection establishes failure, starts to fall back to CS network to complete this time company of calling It connects.

Wherein, when LTE terminal is in IDLE state, the callee side network equipment sends CS Paging message to LTE terminal；When LTE terminal is in non-IDLE state, the callee side network equipment sends CS Service Notification message to LTE terminal.

206, terminal is after T2 time-out, resource that release steps 204 are distributed.

The specific implementation process of above-mentioned steps 201 to step 206 can refer to the prior art, and the embodiment of the present application repeats no more.

Inventor has found under study for action, in above-mentioned scene, CS-Retry timer T1 that the callee side network equipment is opened when it is more than ten seconds a length of, the timer T2 that LTE terminal is opened when it is a length of between 1 minute to 3 minutes.Then due to poor etc. IMS network communication quality, after the particular message that network side equipment does not receive always LTE terminal reply leads to T1 time-out, network side equipment thinks that the calling connection of this IMS network establishes failure, and re-initiates CS calling connection to LTE terminal by CS network to complete this time to converse.But since CS business and IMS call business are two mutual independent business.The module for carrying CS business is CS module, carrying IMS business is VoLTE module, lack communication between CS module and VoLTE module, when the CS business of CS module being caused to begin setting up, the IMS calling connection of IMS module is still in establishment process, still resource described in step 204 is occupied, the wasting of resources is caused.

In addition, inventor is in the course of the research, it was found that: in the prior art, as shown in Figure 3b, before receiving the T2 opened when first time call request time-out, terminal receives second of call request, then terminal refuses second of call request.The process the following steps are included:

207, terminal receives the INVITE request message that network side equipment is sent.

Wherein, which indicates that terminal receives second of IMS call request.

208, terminal replys " 486BUSY " to network side equipment.

Inventor studies discovery, terminal is when receiving second of call request, the reason of refusing second of call request is: since the previous IMS calling connection of LTE terminal does not discharge, terminal thinks a preceding IMS calling connection just in establishment process, it will lead to terminal and the new IMS call request be considered as the 2nd road incoming call, then LTE terminal provides to send the message call requests new with rejection such as " 486Busy " according to agreement, causes new incoming call to connect obstructed.In this case, even if the new call request is sent after having carried out CS call and CS end of conversation after CS network is fallen back in the call request of first time IMS, terminal is actually and there is no any effective calls to connect, but since LTE terminal thinks to cause terminal that can not establish new IMS calling connection there is currently the IMS calling connection just in establishment process.

To solve the above-mentioned problems, the embodiment of the present application provides a kind of call connection establishing method, as shown in figure 4, method includes the following steps:

301, terminal receives the first notification message.

302, terminal establishes the first IMS calling connection according to first notification message and distributes resource for the first IMS calling connection.

Wherein, first notification message is IMS call-in reporting message.The IMS call-in reporting message is for beginning setting up IMS calling connection after notifying terminal to have IMS incoming call, terminal to receive the IMS call-in reporting message and distributing resource for the IMS call request.

Specifically, the IMS call-in reporting message is INVITE message.After terminal receives INVITE message, It begins setting up IMS calling connection and creates thread and distribution resource etc. for the IMS calling connection to be established.The resource includes the media resources such as memory, reserved audio-video, initializes the transfer resources such as the related example of IMS agreement.

In addition, opening timing device T2, before timer T2 time-out, terminal success sends 180RING message to network side equipment, then it represents that IMS calling connection is successfully established after terminal receives INVITE message；Otherwise, before T2 time-out, terminal is constantly in IMS calling connection establishment process.

Illustratively, as shown in fig. 4 a, IMS calling connection is begun setting up after the INVITE request message that terminal receives and distributes resource for the IMS calling connection, the process of the distribution resource includes following one or more movements: creation Server Transaction, create Dialog, create Session, timing wake-up power supply, resource reservation (precondiction) treatment process, start Trying Timer, initial media resource, bind socket, initialize RTP/RTCP Media Stream, initialize audio resource, start called jingle bell timer, start Session Timer timer, start RSEQ X Timer timer, start sessio N Timer J timer etc..

303, terminal receives second notification message.

Optionally, the second notification message includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent.

Wherein, the CS notification message is fall call request to CS network by IMS network after rise after to establish CS calling connection and establish after CS connection any message carried out in CS communication process.

Illustratively, as shown in figure 5, the CS notification message is CS call-in reporting message, which includes CS paging (Paging) message that network side equipment is sent when terminal is in idle (Idle) state.Alternatively, the CS call-in reporting message further includes CS Service Notification (CS Service Notification) message that network side equipment is sent when terminal is in non-Idle state.CS Paging message and CS Service Notification message, which are used to indicate terminal, new CS incoming call.Optionally, the CS calling connection which can also send for network side equipment is successfully established (CS Connection SETUP) instruction message.Optionally, start instruction message such as CONNECT message of conversing after which can also be successfully established for CS calling connection, or the end of conversation instruction message after end of conversation, such as DISCONNECT message.

Network side equipment is in the case where thinking the not available situation of IMS network, just meeting instruction terminal falls back to CS network to complete this time to converse, therefore, when terminal receives the CS notification message, show that the currently IMS connection established may release the IMS connection for invalid or network side, then terminal execution following step 304.

The instruction message that the network side equipment is sent is the instruction message sent after network side equipment confirms that IMS calling connection establishes failure to terminal, which is used to indicate the resource that the IMS calling connection that terminal release is currently being established occupies.Therefore, when terminal receives the instruction message, show that the current IMS calling connection established may release the IMS calling connection for invalid or network side, then terminal executes following step 304.

304, terminal discharges the resource that the first IMS calling connection occupies according to the second notification message.

Illustratively, as shown in Figure 4 b, terminal discharges IMS calling connection after receiving CS notification message The resource of occupancy, the process for the resource that release IMS calling connection occupies include one or more of movement: cancelling RSEQ X Timer timer, cancel Session Timer timer, release audio resource, cleaning socket, delete the Dialog created, deleting and receive the Server Transaction created after INVITE and cancel session Timer J timer etc..

The above method, terminal is during establishing IMS calling connection, if receiving second notification message, the instruction message or the 2nd IMS call-in reporting message that the second notification message can send for CS notification message, network side equipment, terminal discharges the resource of the occupancy of the IMS calling connection just in establishment process in time, can economize on resources.

When receiving the second notification message in view of terminal, terminal may currently be successfully established IMS calling connection, and be conversed using the IMS calling connection.Then it has been interrupted in the call that the resource that the IMS calling connection of speech phase occupies causes this in progress in order to avoid accidentally releasing this, before step 304, the above method further include: terminal determines whether the first IMS calling connection is in establishment process according to the second notification message；If the first IMS calling connection is in establishment process, the terminal discharges the resource that the first IMS calling connection just in establishment process occupies.

In the specific implementation, inquiry is currently with the presence or absence of the state for the calling entity and the calling entity safeguarded after terminal receives second notification message.When the state of the calling entity is call setup, the IMS resource that IMS calling occupies is discharged.When the state of the calling entity is other states, when such as jingle bell or call, then it is not necessarily to discharge the resource of IMS calling connection occupancy.

In practical application, according to the type of service of transmission, modem logically can be divided into VoLTE module, LTE module, CS module, 2G/3G module etc..Wherein, VoLTE module is used to carry the data service of LTE network for carrying IMS business, LTE module；CS module is used to carry the data service of 2G, 3G network for carrying CS business, 2G, 3G module.

In one implementation, by the current IMS calling connection just in establishment process of LTE module notice VoLTE module release of terminal.

Illustratively, the embodiment of the present application provides a kind of call connection establishing method, in this method, terminal is in Idle state, the LTE module of terminal receives the CS Paging message of network side equipment transmission, or terminal, in busy state, the LTE module of terminal receives the CS Service Notification message of network side equipment transmission, then the LTE module notice VoLTE module of terminal discharges the resource that the IMS calling connection just in establishment process occupies.As shown in Figure 5 a, method includes the following steps:

401, network side equipment receives the first call request.

Wherein, first call request is that calling terminal initiates and is forwarded to the callee side network equipment by the Calling Side network equipment.The type of the call request is unlimited, in Fig. 5 a with the call request be IMS call request, i.e., the call request be INVITE message for be illustrated.

402, network side equipment sends INVITE message to the VoLTE module of called terminal and opens CS-Retry timer T1.

403, the VoLTE module of terminal establishes IMS calling connection after receiving INVITE message, and distributes resource for this IMS calling connection.

In addition, also to reply 100TRYING message to network side equipment after terminal receives the INVITE message.The 100TRYING message indicates that terminal has been received by the INVITE message.

404, the CS-Retry timer T1 time-out that network side equipment is opened, network side equipment determines whether terminal is in Idle state, if terminal is in Idle state, network side equipment sends CS Paging message to the LTE module of terminal；If terminal is in busy state, network side equipment sends CS Service Notification message to the LTE module of terminal.

Wherein, which begins setting up CS calling connection for notifying terminal to have CS calling.

405, the LTE module of terminal sends instruction message to VoLTE module.

Wherein, which is used to indicate the resource that the current IMS calling connection just in establishment process of VoLTE module release occupies.The specific implementation of the instruction message can be by the customized setting of manufacturer terminal.

In step 404, after the LTE module of terminal receives CS Paging message or CS Service Notification message, the call request for having received CS network is indicated.This shows that the calling connection of IMS network establishes failure, then LTE module notice VoLTE module is released to the resource of this IMS calling connection distribution.

As it can be seen that increasing the communication process of LTE module and VoLTE module in terminal, and then the resource that LTE module can notify the current IMS calling connection just in establishment process of VoLTE module release to occupy in time in the embodiment of the present application.

406a, terminal VoLTE module receive the instruction message of LTE module transmission after, whether detection currently has IMS calling connection just in establishment process.

Optionally, after the VoLTE module of terminal receives the instruction message that LTE module is sent, detection is currently with the presence or absence of the IMS calling connection just in establishment process, if it is present executing following step 406b；If there is the IMS calling connection for having had begun call, then the VoLTE module of terminal is not necessarily to discharge the resource that the IMS calling connection for having had begun call occupies, which can refer to the prior art, and details are not described herein again；If both there is no the IMS calling connections just in establishment process, the calling connection completed and for IMS call is also had built up there is no IMS calling connection, then shows the vacant resource of VoLTE module, then the VoLTE module of terminal is without discharging any resource.

406b, terminal VoLTE module release IMS calling connection occupy resource.

407, the LTE module of terminal replys EMM_EXTENDED_SER_REQ (CSFB) message to network side equipment.

Wherein, EMM_EXTENDED_SER_REQ (CSFB) message indicates that terminal has been received by CS call-in reporting message, terminal receives circuit domain dropping (the Circuit Switched Fallback of network side equipment, CSFB it) requests, instruction terminal is switched to 2/3G after network side receives the message, and establishes CS call.

408, network side equipment sends CC SETUP message to the CS module of terminal.

Wherein, CC SETUP message expression is successfully established CS calling connection.

409, the CS module of terminal sends CONNECT message to network side equipment.

Wherein, CONNECT message indicates that caller both sides start to converse in CS network.

410, the CS module of terminal sends DISCONNECT message to network side equipment, or receives the DISCONNECT message that calling terminal is sent.

Wherein, DISCONNECT message indicates this CS end of conversation.When calling terminal, which is hung up, this time to be conversed, terminal receives the DISCONNECT message of network side equipment transmission；When called terminal hangs up this When secondary call, terminal sends DISCONNECT message to network side equipment.This sentences for called terminal hangs up this time call and is illustrated.

Later, when terminal receives new incoming call, even terminal can respond the new incoming call, which includes the following steps: before T2 time-out

411, network side equipment receives the second call request.

The specific implementation of the step can refer to step 401, and details are not described herein again.

412, network side equipment sends INVITE message to the VoLTE module of terminal.

413, the VoLTE module of terminal begins setting up new IMS calling connection after receiving the INVITE message that network side equipment is sent, and distributes resource for the secondary IMS calling connection.

414, the VoLTE module of terminal replys 100TRYING message to network side equipment.

415, the VoLTE module of terminal replys 183Session Progress message or 180RING message to network side equipment.

Later, terminal is completed this time to converse by CS network, which can refer to the prior art, and details are not described herein again.

It should be noted that above-mentioned signaling, such as INVITE, 100TRYING, 183Session Progress, 180RING message are signaling as defined in Session initiation Protocol (Session Initiation Protocol, SIP)；The message such as CS Paging, CS Service Notification, EMM_EXTENDED_SER_REQ (CSFB), CC SETUP, CONNECT, DISCONNECT are signaling relevant to CS call, the specific implementation can refer to the prior art, and details are not described herein again.

It can be seen that, in the method shown in Fig. 5 a, the LTE module of terminal is after CS Paging or CS the Service Notification message for receiving network side equipment transmission, the resource of the current IMS calling connection occupancy just in establishment process of notice VoLTE module release.

Optionally, in other implementations, increase the communication process of CS module and VoLTE module, the occupied resource of IMS calling connection is discharged by CS module notice VoLTE module.

Illustratively, after the CC SETUP message that the CS module of terminal receives network side equipment transmission, by the resource of CS module notice VoLTE module release IMS calling connection occupancy.Then, as shown in Figure 5 b, method includes the following steps:

501, network side equipment receives the first call request.

502, network side equipment sends INVITE message to the VoLTE module of called terminal and opens CS-Retry timer T1.

503, the VoLTE module of terminal establishes IMS calling connection after receiving INVITE message and distributes resource for IMS calling connection.

504, the CS-Retry timer T1 time-out that network side equipment is opened, network side equipment determines whether terminal is in Idle state, if terminal is in Idle state, network side equipment sends CS Paging message to the LTE module of terminal；If terminal is in busy state, network side equipment sends CS Service Notification message to the LTE module of terminal.

505, the LTE module of terminal replys EMM_EXTENDED_SER_REQ (CSFB) message to network side equipment.

506, network side equipment sends CC SETUP message to the CS module of terminal.

507, the CS module of terminal sends instruction message to VoLTE module, which is used to indicate the resource that VoLTE module release IMS calling connection occupies.

By the step, the communication of CS module and VoLTE module is increased, and then CS module can notify in time the current IMS calling connection just in establishment process of VoLTE module release after being successfully established CS calling connection.

508a, terminal VoLTE module receive the instruction message of CS module transmission after, whether detection currently has IMS calling connection just in establishment process.

508b, terminal VoLTE module discharge the IMS calling connection occupancy resource.

The specific implementation of above-mentioned steps 508a and 508b can refer to step 406a and 406b, and details are not described herein again.

509, the CS module of terminal sends CONNECT message to network side equipment.

Optionally, it is executed due to step 508a and step 508b by VoLTE module, step 509 is executed by LTE module.Therefore, which can also be performed before step 508a and step 508b, can also carry out simultaneously with step 508a and step 508b, the present embodiment does not limit.

510, the CS module of terminal sends DISCONNECT message to network side equipment, or receives the DISCONNECT message that calling terminal is sent.

Later, before T2 time-out, when terminal receives new incoming call, terminal can respond the new incoming call, which includes the following steps:

511, network side equipment receives the second call request.

512, network side equipment sends INVITE message to the VoLTE module of terminal.

513, the VoLTE module of terminal establishes the second calling connection after receiving the INVITE message that network side equipment is sent and distributes resource for second calling connection.

514, the VoLTE module of terminal replys 100TRYING message to network side equipment.

515, the VoLTE module of terminal replys 183Session Progress message or 180RING message to network side equipment.

Optionally, in other implementations, above-mentioned steps 507, step 508a and step 508b can also be performed after step 509 or step 510 other than it can execute after procedure 506.Such as: it is smaller to the change of existing protocol in this way by the current IMS calling connection just in establishment process of CS module notice VoLTE module release after CS end of conversation.

In other implementations, since network side equipment is when establishing IMS calling connection not successfully, meeting instruction terminal, which falls back to CS network, to be established CS calling connection and completes this call request in CS network, therefore, the rear to terminal transmission instruction message of IMS calling connection failure is being determined from network side equipment, is being used to indicate the resource that the current IMS calling connection just in establishment process of terminal release occupies.Therefore, the embodiment of the present application also provides a kind of method of call setup, as shown in fig. 6, this method comprises:

601, terminal receives IMS call-in reporting message.

602, terminal establishes IMS calling connection according to the IMS call-in reporting message and distributes resource for the IMS calling connection.

The specific implementation of step 601 and step 602 can refer to step 301 and step 302, no longer superfluous herein It states.

603, terminal receives the instruction message that network side equipment is sent.

Wherein, the instruction message is used to indicate the resource that the current IMS calling connection just in establishment process of terminal release occupies.The mark, indication field etc. of carried terminal in the instruction message, the value of the indication field are that particular value is used to indicate the current IMS calling connection just in establishment process of terminal release.The instruction message can be the message newly defined, or utilize existing message, and increase the indication field using idle bytes in existing message.

The instruction message is sent to terminal by network side equipment.Specifically, network side equipment can open CS-Retry timer T1 when sending INVITE message to terminal, if network side equipment does not receive the particular message of terminal replies yet after T1 time-out, then network side equipment thinks that the IMS calling connection establishes failure, then after T1 time-out, network side equipment sends the instruction message to terminal.

604, terminal discharges the resource that the IMS calling connection occupies according to the instruction message.

In the above method, when network side equipment determines that IMS calling connection establishes failure, discharges the resource of the occupancy of the IMS calling connection just in establishment process in time by network side equipment notice terminal, can economize on resources.

It is exemplary, by taking the resource that network side equipment notifies the current IMS calling connection just in establishment process of VoLTE module release of terminal to occupy after CS-Retry timer T1 time-out as an example, as shown in Figure 6 a, method includes the following steps:

701, network side equipment receives the first call request.

702, network side equipment sends INVITE message to the VoLTE module of terminal and opens CS-Retry timer T1.

703, the VoLTE module of terminal establishes IMS calling connection after receiving INVITE message and distributes resource for this IMS calling connection.

704, the CS-Retry timer T1 time-out that network side equipment is opened sends instruction message to the VoLTE module of terminal, which is used to indicate the resource that the current IMS calling connection just in establishment process of VoLTE module release occupies.

705, the VoLTE module of terminal is after the instruction message for receiving network side equipment transmission, the resource of release IMS calling connection occupancy.

Optionally, after terminal receives instruction message described in step 704, response message is replied for indicating that terminal has been received by the instruction message to network side equipment.

706, network side equipment determines whether terminal is in Idle state, if terminal is in Idle state, network side equipment sends CS Paging message to the LTE module of terminal；If terminal is in busy state, network side equipment sends CS Service Notification message to the LTE module of terminal.

707, the LTE module of terminal replys EMM_EXTENDED_SER_REQ (CSFB) message to network side equipment.

708, network side equipment sends CC SETUP message to the CS module of terminal.

709, the CS module of terminal sends CONNECT message to network side equipment.

710, the CS module of terminal sends DISCONNECT message to network side equipment, or receives the DISCONNECT message that calling terminal is sent.

By above-mentioned steps 704 and step 705, terminal discharges the resource of IMS calling connection occupancy according to the instruction message of network side equipment in time, and later, terminal can respond new IMS call request.

711, network side equipment receives the second call request.

712, network side equipment sends INVITE message to the VoLTE module of terminal.

713, the VoLTE module of terminal begins setting up new IMS calling connection after receiving the INVITE message that network side equipment is sent, and distributes resource for the secondary IMS calling connection.

714, the VoLTE module of terminal replys 100TRYING message to network side equipment.

715, the VoLTE module of terminal replys 183Session Progress message or 180RING message to network side equipment.

Later, it is interacted between terminal and network side equipment to complete this time to converse, which can refer to the prior art, and details are not described herein again.

In practical application, inventor also found in the course of the research, in fact it could happen that such situation is, as shown in Figure 7, calling terminal initiates first time call request, and called terminal establishes IMS calling connection after receiving the call request and distributes resource for the IMS calling connection.Before the IMS calling connection is successfully established, namely before called terminal is the T2 time-out that the first time call request is opened, calling terminal has sent cancel message to cancel and this time converse, but due to network communication quality difference etc., called terminal does not receive the cancel message, and then the IMS calling connection of called terminal is constantly in establishment process.In this way, called terminal can be since there is currently the IMS calling connections just in establishment process directly to reply " 486BUSY " in turn to refuse second of call request of calling terminal initiation when calling terminal initiates call request again.

To solve the above-mentioned problems, a kind of implementation is that terminal receives the first IMS call-in reporting message, and establishes the first IMS calling connection according to the first IMS call-in reporting message and distribute resource for the first IMS calling connection；Terminal receives the 2nd IMS call-in reporting message, and discharges the resource that the first IMS calling connection occupies according to the 2nd IMS call-in reporting message.

In above-mentioned implementation, in the establishment process in first time IMS calling connection, when terminal receives second of IMS call request, terminal discharges the resource that the first time IMS calling connection occupies and responds second of IMS call request.

As another optional way, the embodiment of the present application also provides a kind of call request method for building up, as shown in figure 8, method includes the following steps:

801, terminal receives the first IMS call-in reporting message.

802, terminal establishes the first IMS calling connection according to the first IMS call-in reporting message and distributes resource for the first IMS calling connection.

Wherein, the first calling number and the first call identification (CALL ID) are carried in the first IMS call-in reporting message.

803, terminal receives the 2nd IMS call-in reporting message.

Wherein, the 2nd IMS call-in reporting message is for notifying terminal to have second of call request of IMS network.The second calling number and the second call identification are carried in 2nd IMS call-in reporting message.

Specifically, the 2nd IMS call-in reporting message is INVITE message.After terminal is received again by INVITE message, in the prior art due to first time IMS incoming call calling connection just in establishment process In, therefore directly refuse second of IMS incoming call and compare, the embodiment of the present application needs to be confirmed whether again after following step judges the resource that the calling connection of first time IMS incoming call to be discharged occupies.

804, whether terminal first calling number and the second calling number identical, and first call identification and the second call identification it is whether identical.

If first calling number is identical with second calling number, and first call identification and the second call identification are different, then execute following step 805.

If first calling number is identical with second calling number, and first call identification and the second call identification are identical, then show that second of the IMS call-in reporting message is that IMS retransmits message, then execute following step 806.

If first calling number is different with second calling number, following step 807 is executed.

805, terminal discharges the resource of the first time IMS calling connection occupancy and responds second of IMS call request.

In this step, after terminal discharges the resource that first time IMS calling connection occupies, for the new IMS calling connection of second of IMS call setup, resource is distributed, and replys the message such as " 183Session Progress " or " 180RING " to network side equipment to respond second of call request.

806, terminal replys confirmation message again.

In this step, terminal replys confirmation message again to indicate that terminal receives the re-transmission message.

807, terminal refuses second of IMS call request.

In this step, terminal replies " 486BUSY " are to refuse second of IMS call request, which can refer to the prior art, and details are not described herein again.

The above method, when terminal receives new IMS call request, if there is the IMS calling connection just in establishment process, then terminal judges whether the calling number carried in the new IMS call request and the current IMS calling connection just in establishment process and CALL ID are identical, if calling number is identical but CALL ID is different, then show that the new call request and the IMS calling connection just in establishment process are same calling terminal, the IMS calling connection just in establishment process may be to have failed or invalid calling connection, then terminal discharges resource that the IMS calling connection just in establishment process occupies and responds new IMS calling connection.By the above method, the connection success rate of IMS call can be improved.

In practical application, it is also possible that scene be that network side equipment to terminal has sent INVITE message, terminal starts to distribute resource and establishes IMS calling connection after receiving the INVITE message, and before terminal jingle bell, which is constantly in IMS calling connection establishment process.But for a user, until terminal jingle bell, user can just learn new incoming call, before this, user thinks that terminal is constantly in no talking state, therefore, in above-mentioned IMS calling connection establishment process, the possible using terminal Outgoing Number of user is to issue new call request.Call request is issued in order to avoid since there are IMS calling connections to occupy resource, causing user not to be available terminal, in such a scenario, the embodiment of the present application also provides a kind of methods of call setup, as shown in figure 9, method includes the following steps:

901, terminal receives IMS call-in reporting message.

902, terminal establishes IMS calling connection according to the IMS call-in reporting message, and distributes resource for IMS calling connection.

903, terminal receives exhalation request.

Illustratively, the exhalation request includes: that user uses the terminal to transfer to some number, which is the exhalation request.

904, terminal discharges the resource that the IMS calling connection occupies according to the exhalation request.

In the above method, terminal receives the exhalation request of user, such as dial request, shows that user wants using terminal and makes a phone call, then terminal discharges the resource of current IMS calling connection occupancy in time to guarantee that user can smoothly make a phone call outward.

It is above-mentioned that mainly scheme provided by the embodiments of the present application is described from the angle of interaction between each network element.It is understood that each network element, such as network side equipment, terminal etc. are in order to realize the above functions, it comprises execute the corresponding hardware configuration of each function and/or software module.Those skilled in the art should be readily appreciated that, each exemplary unit and algorithm steps of the embodiment description in conjunction with disclosed in the embodiment of the present application, and the application can be realized with the combining form of hardware or hardware and computer software.Some function is executed in a manner of hardware or computer software driving hardware actually, specific application and design constraint depending on technical solution.Professional technician can use different methods to achieve the described function each specific application, but this realization is it is not considered that exceed scope of the present application.

Two or more functions can also be integrated in a processing module according to the division that above method example carries out functional module to each network element etc. for example, each functional module of each function division can be corresponded to by the embodiment of the present application.Above-mentioned integrated module both can take the form of hardware realization, can also be realized in the form of software function module.It should be noted that being schematically that only a kind of logical function partition, there may be another division manner in actual implementation to the division of module in the embodiment of the present application.

In the case where each function division of use correspondence each functional module, Figure 10 shows a kind of possible structural schematic diagram of terminal involved in above-described embodiment, and terminal 1000 includes receiving unit 1001, connection establishment unit 1002 and Connection Release unit 1003.Wherein, for receiving unit 1001 for supporting terminal 1000 to receive the first notification message, which includes the first IMS call-in reporting message.Connection establishment unit 1002 is for supporting terminal 1000 to establish the first IMS calling connection according to received first notification message of the receiving unit 1001 and distributing resource for the first IMS calling connection.Receiving unit 1001 is also used to support terminal 1000 to receive second notification message, which includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent.Connection Release unit 1003 is used to that terminal 1000 to be supported to discharge the resource that the first IMS calling connection occupies according to the received second notification message of the receiving unit 1001.

Optionally, the Connection Release unit 1003 is also used to determine whether the first IMS calling connection is in establishment process according to the second notification message；When the resource that the first IMS calling connection is in establishment process, and the first IMS calling connection of the release just in establishment process occupies.

Optionally, the second notification message is the 2nd IMS call-in reporting message, carries the first calling number and the first call identification in the first IMS call-in reporting message；The second calling number and the second call identification are carried in the 2nd IMS call-in reporting message.The then Connection Release unit 1003, is also used to the first calling number described in comparison and whether second calling number is identical；Compare first call identification and whether second call identification is identical；When first calling number is identical with second calling number, and first call identification is with the second call identification difference, the resource that the first IMS calling connection occupies is discharged.Correspondingly, the connection Unit 1002 is established, is also used to establish the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.

Wherein, all related contents for each step that above method embodiment is related to can quote the function description of corresponding function module, and details are not described herein.

Using integrated unit, Figure 10 a shows a kind of possible structural schematic diagram of terminal involved in above-described embodiment.Terminal 1100 includes: processing module 1102 and communication module 1103.Processing module 1102 is used to carry out the movement of terminal 1100 control management, and communication module 1103 is used to support the communication of terminal 100 Yu other network entities.Specifically, communication module 1103, for supporting terminal 1100 to receive the first notification message, which includes the first IP multimedia subsystem IMS call-in reporting message.Processing module 1102 is for supporting terminal 1100 to establish the first IMS calling connection according to first notification message and distributing resource for the first IMS calling connection.The communication module 1103 is also used to support terminal 1100 to receive second notification message, which includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent.The resource that the processing module 1102 is also used to that terminal 1100 is supported to be occupied according to the second notification message, release the first IMS calling connection.

Optionally, the processing module 1102 is also used to determine whether the first IMS calling connection is in establishment process according to the second notification message；When the first IMS calling connection is in establishment process, then the resource that the first IMS calling connection just in establishment process occupies is discharged.

Optionally, the second notification message is the 2nd IMS call-in reporting message, carries the first calling number and the first call identification in the first IMS call-in reporting message；The second calling number and the second call identification are carried in the 2nd IMS call-in reporting message.The then processing module 1102, is also used to the first calling number described in comparison and whether second calling number is identical；Compare first call identification and whether second call identification is identical；When first calling number is identical with second calling number, and first call identification is with the second call identification difference, the resource that the first IMS calling connection occupies is discharged.In addition, the processing module 1102, is also used to establish the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.

Wherein, processing module 1102 can be processor or controller, such as it can be central processing unit (Central Processing Unit, CPU), general processor, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit (Application-Specific Integrated Circuit, ASIC), field programmable gate array (Field Programmable Gate Array, FPGA) either other programmable logic device, transistor logic, hardware component or any combination thereof.It, which may be implemented or executes, combines various illustrative logic blocks, module and circuit described in present disclosure.The processor is also possible to realize the combination of computing function, such as combines comprising one or more microprocessors, DSP and the combination of microprocessor etc..Communication module 1103 can be transceiver, transmission circuit or communication interface etc..Memory module 1101 can be memory.

When processing module 1102 is processor, communication module 1103 is transceiver, and when memory module 1101 is memory, terminal involved in the embodiment of the present application can be terminal shown in Figure 10 b.

As shown in fig. lob, which includes: processor 1201, transceiver 1202, memory 1203 and bus 1204.Wherein, transceiver 1202, processor 1201 and memory 1203 are connected with each other by bus 1204；Bus 1204 can be Peripheral Component Interconnect standard (Peripheral Component Interconnect, PCI) bus or expanding the industrial standard structure (Extended Industry Standard Architecture, EISA) bus etc..The bus can be divided into address bus, data/address bus, control bus etc..Only to be indicated with a thick line in Figure 10 b, it is not intended that an only bus or a type of bus convenient for indicating.

The step of method in conjunction with described in present disclosure or algorithm, can be realized in a manner of hardware, be also possible to execute the mode of software instruction by processor to realize.Software instruction can be made of corresponding software module, software module can be stored on random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read Only Memory, ROM), Erasable Programmable Read Only Memory EPROM (Erasable Programmable ROM, EPROM), in the storage medium of Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM (CD-ROM) or any other form well known in the art.A kind of illustrative storage medium is coupled to processor, to enable a processor to from the read information, and information can be written to the storage medium.Certainly, storage medium is also possible to the component part of processor.Pocessor and storage media can be located in ASIC.

It will be appreciated that in said one or multiple examples, function described herein can be realized those skilled in the art with hardware, software, firmware or their any combination.When implemented in software, these functions can be stored in computer-readable medium or as on computer-readable medium one or more instructions or code transmit.Computer-readable medium includes computer storage media and communication media, and wherein communication media includes convenient for from a place to any medium of another place transmission computer program.Storage medium can be any usable medium that general or specialized computer can access.

Above-described specific embodiment; the purpose of the application, technical scheme and beneficial effects are had been further described; it should be understood that; the foregoing is merely the specific embodiments of the application; it is not used to limit the protection scope of the application; all any modification, equivalent substitution, improvement and etc. on the basis of the technical solution of the application, done should all include within the scope of protection of this application.

Claims

A kind of call-establishing method, which is characterized in that the method is applied to terminal, which comprises

The terminal receives the first notification message, and first notification message includes the first IP multimedia subsystem IMS call-in reporting message；

The terminal establishes the first IMS calling connection according to first notification message and distributes resource for the first IMS calling connection；

The terminal receives second notification message, and the second notification message includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent；

The terminal discharges the resource that the first IMS calling connection occupies according to the second notification message.
The method according to claim 1, wherein the terminal discharges the resource that the first IMS calling connection occupies according to the second notification message, comprising:

The terminal determines whether the first IMS calling connection is in establishment process according to the second notification message；

If the first IMS calling connection is in establishment process, terminal if, discharges the resource that the first IMS calling connection just in establishment process occupies.
Method according to claim 1 or 2, which is characterized in that the CS notification message includes that notification message has been established in CS call-in reporting message, CS calling connection, CS call begins setting up message, any one in CS end of conversation instruction message.
Method according to claim 1 or 2, which is characterized in that the instruction message that the network side equipment is sent is used to indicate terminal and discharges the resource that the first IMS calling connection occupies.
Method according to claim 1 or 2, which is characterized in that the second notification message is the 2nd IMS call-in reporting message, carries the first calling number and the first call identification in the first IMS call-in reporting message；The second calling number and the second call identification are carried in the 2nd IMS call-in reporting message；

The terminal discharges the resource that the first IMS calling connection occupies according to the second notification message, comprising:

Whether terminal first calling number and second calling number are identical；Compare first call identification and whether second call identification is identical；

If first calling number is identical with second calling number, and first call identification is different with second call identification, and the terminal then discharges the resource that the first IMS calling connection occupies.
According to the method described in claim 5, it is characterized in that, in the terminal according to the second notification message, after discharging the resource that the first IMS calling connection occupies, the method also includes:

The terminal establishes the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.
A kind of terminal characterized by comprising

Receiving unit, for receiving the first notification message, first notification message includes the first IP multimedia subsystem IMS call-in reporting message；

Connection establishment unit, for establishing the first IMS calling connection according to received first notification message of the receiving unit and distributing resource for the first IMS calling connection；

The receiving unit is also used to receive second notification message, and the second notification message includes any one in following message: instruction message, the 2nd IMS call-in reporting message that circuit switching (CS) notification message, network side equipment are sent；

Connection Release unit, for discharging the resource that the first IMS calling connection occupies according to the received second notification message of the receiving unit.
Terminal according to claim 7, which is characterized in that

The Connection Release unit is also used to determine whether the first IMS calling connection is in establishment process according to the second notification message；When the first IMS calling connection is in establishment process, the resource that the first IMS calling connection just in establishment process occupies is discharged.
Terminal according to claim 7 or 8, which is characterized in that the CS notification message includes that notification message has been established in CS call-in reporting message, CS calling connection, CS call begins setting up message, any one in CS end of conversation instruction message.
Terminal according to claim 7 or 8, which is characterized in that the instruction message that the network side equipment is sent is used to indicate terminal and discharges the resource that the first IMS calling connection occupies.
Terminal according to claim 7 or 8, which is characterized in that the second notification message is the 2nd IMS call-in reporting message, carries the first calling number and the first call identification in the first IMS call-in reporting message；The second calling number and the second call identification are carried in the 2nd IMS call-in reporting message；

The Connection Release unit, is also used to the first calling number described in comparison and whether second calling number is identical；Compare first call identification and whether second call identification is identical；When first calling number is identical with second calling number, and first call identification is with the second call identification difference, the resource that the first IMS calling connection occupies is discharged.
Terminal according to claim 11, which is characterized in that the connection establishment unit is also used to establish the 2nd IMS calling connection according to the 2nd IMS call-in reporting message.
A kind of terminal, it is characterized in that, the terminal includes transceiver, one or more processors and memory, the memory is for storing computer program code, the computer program code includes instruction, when one or more of processors execute described instruction, the terminal executes such as method as claimed in any one of claims 1 to 6.
A kind of computer readable storage medium is stored with instruction in the computer readable storage medium, when run on a computer, so that computer executes the described in any item methods of the claims 1 to 6.
A kind of computer program product, the computer program product include instruction, when run on a computer, so that computer perform claim requires 1 to 6 described in any item methods.